raid10 combines the speed of raid0 with the resilience of raid1. setup of GNU Linux mdadm software RAID10 is actually pretty straight forward: no need to do any partitioning. # tested on hostnamectl; Operating System: Debian GNU/Linux 11 (bullseye) Kernel: […]
first off the praise: kvm-qemu is a high performance nicely scriptable virtualization system if it works, it can do pretty things 🙂 especially like the x11 forwarded virt-manager gui over ssh (yes it is a bit slow… but simplicity at […]
intro: would the user pay 100€ per month for a super fast uplink (in this case Starlink, x>150MBit/sec!!! (it (of course) fluctuates, also there is a BATTLE going on between SpaecX (StarLink) & Amazon (Project Kuiper) which hopefully does not […]
thanks to this excellent script it is now possible to nat-port forward multiple ports from: [internet]<->host<->vm thanks & great work all invovled 🙂 here is the script: etc_libvirt_hooks_qemu.txt in NAT mode, the host firewall stands between the wild wild west […]
update: 2021-08 can NOT recommend TL-WA901ND <-bridge-with-ap-mode-> TL-WA901ND, get frequent disconnects/reconnects (every ~20min for 30sec? it also might be to bad signal-receipten or something disturbing the signal at that rate) to extend StarLink WIFI and older tp-link + external antenna […]
hostnamectl; # tested on Static hostname: lenovo Operating System: Debian GNU/Linux 10 (buster) Kernel: Linux 4.19.0-17-amd64 Architecture: x86-64 # with virsh –version 5.0.0 libvirtd –version libvirtd (libvirt) 5.0.0 /usr/bin/kvm –version QEMU emulator version 3.1.0 (Debian 1:3.1+dfsg-8+deb10u8) Copyright (c) 2003-2018 Fabrice […]
tested on host # debian 10 this option is only available in the gui on newer versions of virsh-manager to create a thin provisioned harddisk of capacity of 32GB image via bash-terminal go: qemu-img create -f qcow2 name-of-harddisk-image.qcow2 32G as […]
hostnamectl; # tested on Static hostname: giada Icon name: computer-desktop Chassis: desktop Operating System: Debian GNU/Linux 10 (buster) Kernel: Linux 4.19.0-17-amd64 Architecture: x86-64 su – root apt update # will install Java Web Start and openjdk-11-jre apt install icedtea-netx java-common […]
every user want’s a fast & responsive internet. There is nothing more anoying than slow loading websites or other services that respond slowly or not at all (timeout) when the user needs them. DNS aka “the phone book of the […]
CentOS 7 (maintained until 2024) is hailed a rock-solid GNU Linux Open Source (?) server OS, hardened by many idelaistic developers & RedHat technicians. …and indeed it performed well on it’s xfs filesystem (thanks all involved also thanks to RedHat […]
harddisk encryption is important from critical data to get physically stolen (can’t do much about data that get’s stolen while DEcrypted) (except: to not have any physical network connection while the data is in DEcrypted state?) hostnamectl; # tested on […]
How to created multiple Wifi AccessPoints connecting (WDS Wifi Bridge) to one central Internet-Wifi-AccessPoint – Difference between TL-WA901N and TL-WA901ND where the Chinese and especially TP-Link and Huawai are very strong is data over radio (4G/LTE/5G/Wifi…) especially the TP-Link products […]
the error message basically means: the VM’s screen can not be auto-resized because the VBoxGuestAdditions kernel module drivers software was not properly build & installed. the solution: rebuild & reinstall the VBoxGuestAdditions (kernel module) properly: hostnamectl; # tested on guest […]
so RedHat developed the virsh manager, but not qemu itself. https://stackoverflow.com/questions/43704856/what-are-the-differences-between-qemu-and-virtualbox QEMU is a generic and open source machine emulator and virtualizer. When used as a machine emulator, QEMU can run OSes and programs made for one machine (e.g. an […]
scroll down to ENGLISH “Zehntausende Mail-Server wegen Exchange-Lücke gehackt. Wegen einer vor wenigen Tagen bekanntgewordenen Sicherheitslücke sind laut US-Medienberichten Zehntausende E-Mail-Server von Unternehmen, Behörden und Bildungseinrichtungen Opfer von Hacker-Attacken geworden. “Deutsche Unternehmen sind im internationalen Vergleich besonders stark von dieser […]
SecurityLab, [22.12.20 10:00] Google has explained the reasons for the massive failure of its services that took place last week. Recall that on December 14 of this year, users around the world for 47 minutes could not access Gmail, YouTube […]
for even better overview, it is possible to label harddisks & partitions like this: # this can be done on mounted ext4 / ext3 / ext2 partitions # swap partitions can not be labeled tune2fs -L “LABEL” /dev/sdaX # with […]
… because one also cares about beauty… a default avatar picture is not an option… but phpBB has a very strict 6KBytes max file size limit for Profile Avatar Pictures… which is almost impossible to reach with format.jpg or format.png […]
not sure if the news rang through… the Amazon Cloud (AWS) guy will be the new CEO of Amazon. What cloud? Amazon “cloud” Hetzner “cloud” cloud (centralized digital infrastructure) can be designed / implemented in different ways. from: the user/admin […]
some gui programs like gparted (very nice harddisk partitioning program) won’t start as root. hostnamectl; # tested on Operating System: Debian GNU/Linux 10 (buster) Kernel: Linux 4.19.0-13-amd64 Architecture: x86-64 su – root; # become root gvim; # fails with E233: […]
SecurityLab, [03.12.20 11:15] Vulnerabilities in open source software can go undetected for more than four years before being discovered. According to the GitHub State of the Octoverse annual report, the use of open source projects, components, and libraries is more […]
for some reason… did ext3 on RAID1 with two disks (seagate + wd) of different sized (2TB but they (of course) are not exactly 2TB) not sure where the problem here was 1) kernel 2) ext3 3) the disks… have […]
this script is for cront-job regular measurement of the available (download) bandwidth, by downloading a 100MByte dd crated (https://dwaves.de/testfile) testfile created like this (creditz): head -c 100m /dev/zero | openssl enc -aes-128-cbc -pass pass:”$(head -c 20 /dev/urandom | base64)” > […]
short story: there is no “Menu” key on the t440 keyboard, (it does the same as clicking r-mouse-button, trackpad buttons can be cumbersome) hostnamectl; # tested on Operating System: Debian GNU/Linux 9 (stretch) Kernel: Linux 4.9.0-14-amd64 Architecture: x86-64 xev; # […]
if hfs+ is greyed out in gparted there is hfs+ compatibility software missing hint: sudo should be up and running, or gparted won’t be able to open a display (as root) and won’t be able to create partitions (as non […]
x11vnc is great, remmina is great (can scale the client window, no matter the vnc server resolution it will fit on the client screen) manpage remmina: remmina.man.txt when the user followed the instructions here on how to setup vnc server […]
DNS servers are the “yellow pages” “phone book” of the internet. whoever is running DNS servers get’s to know all queries send (what client is requesting and probably connecting to what address… basically: what websites the user have visited, this […]
hostnamectl; # tested on Static hostname: hpServerG6 Operating System: Debian GNU/Linux 10 (buster) Kernel: Linux 4.19.0-12-amd64 Architecture: x86-64 su – root; apt update; apt install qemu-kvm libvirt-clients libvirt-daemon-system bridge-utils virtinst libvirt-daemon virt-manager usermod -a -G libvirt user; # give user […]
to recover the data: how to mount luks2 encrypted volume possibility: remove harddisk, attach to sata2usb adapter, then mount on different machine like this: # unlock encrypted harddisk udisksctl unlock -b /dev/sdb5 udisksctl mount -b /dev/mapper/ubuntu–vg-root Mounted /dev/dm-1 at /media/dpm/e8cf82c0-f0a3-41b3-ab28-1f9d23fcfa72 […]
btw: love kvm (used by very large companies) just as virtualbox (oracle) the task: over the years a windows vm is using up massive amounts of precious server harddisk space (snapshots before everyupdate) all the snapshots now add up to […]